William nisbett



(No Model.) 7

W. NISBETT. BUILDER'S LEVEL.

No. 500,031. Patented June 20, 1893.

7 zlonaldz wmyh UNITED STATES PATENT OFFICE.

WILLIAM' NISBETT, OF TORONTO, CANADA.

BUILDERS LEVEL.

SPECIFICATION forming part of Letters Patent No. 500,031, dated June 20, 1893.

Application filed September 19, 1892. Serial No. 446,309. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM NIsBETT, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented a certain new and Improved Builders Level, of which the following is a specification.

The object of the invention is to produce a sensitive builders level without using mercury, spirits or any other liquid, and it consists in the peculiar construction, arrangement and combinations of parts hereinafter more particularly described and then definitely claimed.

The drawing represents a perspective view of a level partially broken away to show my invention.

A, represents a plain block made similar to the block used on all spirit levels.

B, is a disk fixed to the spindle O, which is journaled in the hangers D, projecting from the plate E. Instead of fixing the disk B, to the spindle 0, tho same eifectwill be produced by journaling the disk itself.

F, is a pointer projecting frorn'the periphery of the disk B. I prefer to use two pointers F, as indicated, as it will be easier to see whether the pointers are perpendicular by glancing at them and the line G, and thus observe whether the surface on which the block A, is placed is level. By the use of the pointers on opposite sides of the disks, as claimed, the person using the instrument need not be exactly in front of the glass II to tell whether or not the surface is level, as, in case the instrument should not be placed on a level surface he could tell by looking at an angle at the glass, as one pointer would be on one side of the line on the glass,while the other pointer would be on the opposite side of the line. In an instrument where only one pointer is used, the one pointer might appear to be in line with the marking point, when looking at it at an angle, while in reality the pointer might be a little to one side. Byanarking the line G, on the glass H, the angle at which the surface lies may be indicated by marking the different angles on the said glass.

In the drawing I show two disks B, close to the glass H, on each side of the bl0ck,.but of course one disk might answer the purpose.

It will be observed that the lower half a, of the disk is Weighted or made thicker and thus heavier than the other half; consequently the half a, of the disk B, will always be on the opposite side and the pointer F, can always be depended upon to point exactly perpendicular.

By having the line I, exactly at right angles to the line G, my improved level may be used as a plumb, the pointer F, then working in connection with the said line.

What I claim as my invention is" A level block A, a plate secured thereto and having hangers D projecting therefrom, a disk comprising two weighted parts B fixed to the spindle O, which spindle is journaled in the said hangers, the disks having pointers on 0pposite sides of their circumferences, and a glass secured to the block having lines mark ed thereon, with which the pointers on the disk register, substantially as and for the purpose specified.

Toronto, September 12, 1892.

WILLIAM NISBETT.

In presence of .I. EDW. MAYBEE, JOHN E. CAMERON. 

